Add-on door/window switch for the HVAC Smart Relay Switch (HSRS), wired model. Magnetic reed switch accommodates 1″ max. gap distance.  Use with a variety of cable types including intercom, telephone, or alarm wire. For normally-closed circuits. Sold as a set of two (2).




  • Compact design (measures 2″ x 3/8″ x 5/16″)
  • Compatible with HSRS system (wired model)
  • Screw terminals for easy, convenient wiring
  • Simple mounting with foam tape or screws (both included)



What’s Included:

  • Reed switch
  • Magnet
  • Double-sided foam tape
  • Screws


  • Intended for use with normally-closed circuits


Tech Sheet:

Wired Sensor


Additional Info:



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Weight 0.2 lbs